import type { HexString } from '../types';
/**
 * @name eip191HashMessage
 * @description
 * keccak256 hash `message` with eip191 method, returns `Uint8Array`. See https://eips.ethereum.org/EIPS/eip-191
 */
export declare function eip191HashMessage(message: Uint8Array | HexString): Uint8Array;